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Smith" To: xen-devel@lists.xenproject.org Cc: "Daniel P. Smith" , jason.andryuk@amd.com, christopher.w.clark@gmail.com, stefano.stabellini@amd.com, Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v6 09/44] x86/boot: introduce boot module types Date: Thu, 17 Oct 2024 13:02:49 -0400 Message-Id: <20241017170325.3842-10-dpsmith@apertussolutions.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20241017170325.3842-1-dpsmith@apertussolutions.com> References: <20241017170325.3842-1-dpsmith@apertussolutions.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External X-ZohoMail-DKIM: pass (identity dpsmith@apertussolutions.com) X-ZM-MESSAGEID: 1729184887750116600 Content-Type: text/plain; charset="utf-8" This commit introduces module types of xen, kernel, and ramdisk to allow bo= ot module detect code to tag the purpose of a boot module. This reduces the ne= ed for hard coded order assumptions and global variables to be used by consume= rs of boot modules, such as domain construction. Signed-off-by: Daniel P. Smith Reviewed-by: Jason Andryuk --- Changes since v5: - added guard around initrd type assignment - removed a missed rebase artifact --- xen/arch/x86/include/asm/bootinfo.h | 9 +++++++++ xen/arch/x86/setup.c | 6 ++++++ 2 files changed, 15 insertions(+) diff --git a/xen/arch/x86/include/asm/bootinfo.h b/xen/arch/x86/include/asm= /bootinfo.h index 5fe4f1387d03..18281d80fa97 100644 --- a/xen/arch/x86/include/asm/bootinfo.h +++ b/xen/arch/x86/include/asm/bootinfo.h @@ -14,6 +14,14 @@ /* Max number of boot modules a bootloader can provide in addition to Xen = */ #define MAX_NR_BOOTMODS 63 =20 +/* Boot module binary type / purpose */ +enum bootmod_type { + BOOTMOD_UNKNOWN, + BOOTMOD_XEN, + BOOTMOD_KERNEL, + BOOTMOD_RAMDISK, +}; + struct boot_module { /* Transitionary only */ module_t *mod; @@ -30,6 +38,7 @@ struct boot_module { * [ decompressed kernel ][ unused rounding ] */ unsigned long headroom; + enum bootmod_type type; }; =20 /* diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c index 1b56eaf26efe..fed9bef16305 100644 --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -311,6 +311,9 @@ static struct boot_info *__init multiboot_fill_boot_inf= o(unsigned long mbi_p) for ( i =3D 0; i <=3D bi->nr_modules; i++ ) bi->mods[i].mod =3D &mods[i]; =20 + /* map the last mb module for xen entry */ + bi->mods[bi->nr_modules].type =3D BOOTMOD_XEN; + return bi; } =20 @@ -1171,6 +1174,7 @@ void asmlinkage __init noreturn __start_xen(unsigned = long mbi_p) =20 bitmap_fill(module_map, bi->nr_modules); __clear_bit(0, module_map); /* Dom0 kernel is always first */ + bi->mods[0].type =3D BOOTMOD_KERNEL; =20 if ( pvh_boot ) { @@ -2059,6 +2063,8 @@ void asmlinkage __init noreturn __start_xen(unsigned = long mbi_p) cpu_has_nx ? "" : "not "); =20 initrdidx =3D find_first_bit(module_map, bi->nr_modules); + if ( initrdidx < bi->nr_modules ) + bi->mods[initrdidx].type =3D BOOTMOD_RAMDISK; if ( bitmap_weight(module_map, bi->nr_modules) > 1 ) printk(XENLOG_WARNING "Multiple initrd candidates, picking module #%u\n", --=20 2.30.2